The header disappeared? I just downloaded the pdf & it shows the exact same layout. Please check if Background graphics is selected or not in the print window.
And yes I'm thinking to add the color & font picker to provide a better experience.
The thing about mobile responsive is if I scale down the preview component, it doesn't fits the A4 format in the print window. I also tried react-component-export-image but it has some bugs with A4 sizing & text isn't selectable. I will have to look for some other ways to download the pdf to make it work in mobile layout. Currently it works fine with tablets.